Nope. Quinn said that the Q weren't omnipotent (all-powerful). Quinn implies that prior to his suicide, Q are omniscient (all-knowing) [http://www.chakoteya.net/Voyager/210.htm]:Especially since Quinn admitted that they're not.
QUINN: Am I interrupting anything?
TUVOK: I am curious. Have the Q always had an absence of manners, or is it the result of some natural evolutionary process that comes with omnipotence?
QUINN: What? Oh, you mean, just popping in whenever we feel like it.
TUVOK: That is one relevant example.
QUINN: I apologise. At some point along the way, I guess we just stopped thinking about the little niceties.
TUVOK: So it seems.
QUINN: But you mustn't think of us as omnipotent, no matter what the Continuum would like you to believe. You and your ship seem incredibly powerful to lifeforms without your technical expertise. It's no different with us. We may appear omnipotent to you, but believe me, we're not.
TUVOK: Intriguing. Just what vulnerabilities do the Q have?
QUINN: Always looking for the tactical advantage, Mister Tuvok. Very good. As a matter of fact, that's why I've come to see you. In a way, our vulnerability is what this is all about. As the Q have evolved, we've sacrificed many things along the way. Not just manners, but mortality, and a sense of purpose, and a desire for change, and a capacity to grow. Every loss is a new vulnerability, wouldn't you say?
[...]
Q: Tell me, what would be the impact of a Q suicide?
Q2: Oh, it would be an interruption to the Continuum. It would change the very nature of Q.
JANEWAY: Can you be more specific?
Q2: No, because we're not even sure what the end result would be. His suicide could have all sorts of unknown consequences to the Continuum.
QUINN: Precisely! It would force the Q to deal with the unknown for the first time since the New Era began. They're afraid of me because they're afraid of the unknown.
[...]
JANEWAY: I can't say I entirely understand what I'm seeing here, but these people don't seem to be suffering.
Q: Of course not. They're happy people. Happy people. What's there to feel sad about? Look at them.
QUINN: They don't dare feel sad. If only they could, that would be progress.
Q: Oh, the philosopher speaks.
QUINN: When I was a respected philosopher, I celebrated the continuity, the undeviation of Q life. I argued that our civilisation had achieved a purity that no other culture had ever approached. And it was wonderful, for a while. At the beginning of the New Era, life as a Q was a continuous dialogue of discovery and issues and humour from all over the universe. But look at them now. Listen to their dialogue now.
TUVOK: I'm afraid I cannot hear any.
QUINN: Because it has all been said. Everyone has heard everything, seen everything. They haven't had to speak to each other in ten millennia. There's nothing left to say.
Q: Well, I don't know about you, but I appreciate a little peace and quiet now and again.
QUINN: It's ironic, isn't it, Q.
TUVOK: I am curious. Have the Q always had an absence of manners, or is it the result of some natural evolutionary process that comes with omnipotence?
QUINN: What? Oh, you mean, just popping in whenever we feel like it.
TUVOK: That is one relevant example.
QUINN: I apologise. At some point along the way, I guess we just stopped thinking about the little niceties.
TUVOK: So it seems.
QUINN: But you mustn't think of us as omnipotent, no matter what the Continuum would like you to believe. You and your ship seem incredibly powerful to lifeforms without your technical expertise. It's no different with us. We may appear omnipotent to you, but believe me, we're not.
TUVOK: Intriguing. Just what vulnerabilities do the Q have?
QUINN: Always looking for the tactical advantage, Mister Tuvok. Very good. As a matter of fact, that's why I've come to see you. In a way, our vulnerability is what this is all about. As the Q have evolved, we've sacrificed many things along the way. Not just manners, but mortality, and a sense of purpose, and a desire for change, and a capacity to grow. Every loss is a new vulnerability, wouldn't you say?
[...]
Q: Tell me, what would be the impact of a Q suicide?
Q2: Oh, it would be an interruption to the Continuum. It would change the very nature of Q.
JANEWAY: Can you be more specific?
Q2: No, because we're not even sure what the end result would be. His suicide could have all sorts of unknown consequences to the Continuum.
QUINN: Precisely! It would force the Q to deal with the unknown for the first time since the New Era began. They're afraid of me because they're afraid of the unknown.
[...]
JANEWAY: I can't say I entirely understand what I'm seeing here, but these people don't seem to be suffering.
Q: Of course not. They're happy people. Happy people. What's there to feel sad about? Look at them.
QUINN: They don't dare feel sad. If only they could, that would be progress.
Q: Oh, the philosopher speaks.
QUINN: When I was a respected philosopher, I celebrated the continuity, the undeviation of Q life. I argued that our civilisation had achieved a purity that no other culture had ever approached. And it was wonderful, for a while. At the beginning of the New Era, life as a Q was a continuous dialogue of discovery and issues and humour from all over the universe. But look at them now. Listen to their dialogue now.
TUVOK: I'm afraid I cannot hear any.
QUINN: Because it has all been said. Everyone has heard everything, seen everything. They haven't had to speak to each other in ten millennia. There's nothing left to say.
Q: Well, I don't know about you, but I appreciate a little peace and quiet now and again.
QUINN: It's ironic, isn't it, Q.
So, when the Battle of Wolf 359 takes place, according to VOY "Death Wish", the Q are omniscient.